Stop clacking your pencils!
别弄得铅笔噼啪乱响！
咔嗒声（clack
现在分词）Stop clacking your pencils!
别弄得铅笔噼啪乱响！
There was a large, low-ceiled room, with clacking, rattling machines at which men in white shirt sleeves and blue gingham aprons were working.
那是个天棚
大房间，里面排列着发隆隆声响机器。
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